Question

15 robinete identice umplu un bazin in 4 ore.Aflati in cat timp umplu 10 robinete identice bazinul?

Answer 1

ASta e regula de 3 simpla 
15 robinete ....... 4 ore
10 robinete ....... x ore

$x = \frac{10 x 4}{15}$ =$\frac{40}{15} = \frac{8}{3} = 2,(6)$

SAU

Transformi orele in minute : 

15 robinete .... 240 minute
10 robinete .... x minute

x = $\frac{10 x 240}{15}$ = 160 minute = 2 ore si 40 minute